What a fabulous story!! I was willing Harry to open his eyes and succumb to the Slytherin manipulation all the way though! Of course it would take Draco pretending to have been exiled to make him see what they stood to lose! So many great laugh out loud lines, super hot sex and a wonderful ending to boot! Severus deserves every single muddy handprint! I noticed you'd said in other comments worrying about writing Draco; well you worried for nothing, becuase he was absolutely perfect; snarky, arrogant and a complete prima donna!
The line that really got me was Harry having as much dominance and submission as he wanted and that is so perfect for him!